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Beaming random lasers with soliton control.

Sreekanth Perumbilavil1, Armando Piccardi2, Raouf Barboza1

  • 1Laboratory of Photonics, Tampere University of Technology, FI-33101, Tampere, Finland.

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|September 23, 2018
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Summary
This summary is machine-generated.

Researchers combined light-induced waveguides (solitons) with random lasers in liquid crystals. This innovation improves laser directionality and control, paving the way for practical random laser applications.

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Area of Science:

  • Nonlinear optics
  • Condensed matter physics
  • Laser physics

Background:

  • Random lasers lack resonators, relying on scattering for feedback, which compromises beam quality.
  • Nematic liquid crystals can exhibit random lasing and support self-guided optical spatial solitons (light-induced waveguides).

Purpose of the Study:

  • To synergistically combine solitons and collinear pumping in dye-doped nematic liquid crystals for enhanced random lasing.
  • To improve the spatial profile, directionality, and controllability of random laser emission.

Main Methods:

  • Utilized weakly scattering, dye-doped nematic liquid crystals.
  • Employed collinear optical pumping near resonance.
  • Leveraged molecular reorientation to form self-guided optical spatial solitons.

Main Results:

  • Achieved concurrent random lasing and self-confinement through soliton formation.
  • Demonstrated all-optical switching with low-power input.
  • Obtained improved laser directionality, a smooth output profile, high-efficiency conversion, and externally controlled angular steering.

Conclusions:

  • Soliton-assisted random lasers offer a novel approach to overcoming limitations of traditional random lasers.
  • This method provides a promising pathway towards application-oriented, high-performance random laser devices.